I worked in a Saturday arabic school for 2 years starting at 17 and ending at 19 as a volunteer teacher assistant, I would go around helping the children who don’t understand, being patient with them is key, I encourage them to find out the answer on their own with a little help from me, if they won’t understand I would help them by giving them an example. For complete beginners I would start with the letters and Harakat, and for more advanced like GCSE I’d go through a past paper with them, I have earn an easy 9 with 96% in my GCSE. As for days I’m available from Friday to Monday since I have university from Tuesday to Thursday, I’m more available on the weekends at any time of the day and I can go up to 2 hours per student.